陕北某矿3号煤层开采导水裂缝带高度测定

导水裂缝带的发育规律及其高度测定对矿井绿色安全开采具有重要意义。为掌握工作面开采过程中的覆岩垮落规律与裂隙发育规律,以陕北某矿3号煤层1309工作面为研究对象,采用物理模拟和工程类比方法进行实验测定。结果表明,工作面充分采动后的导水裂缝带高度为101.7 m,裂采比33.9;覆岩中第二关键层可以有效地抑制竖向裂隙的发育,对该工作面的导水裂缝带发育起主要控制作用。研究成果可对该煤矿开采过程中顶板水害防治提供一定的指导和借鉴。

Height determination of water flowing fracture zone in No.3 coal seam of a coal mine in Northern Shaanxi

The development law and height measurement of the water flowing fracture zone have great significance for the green and safe mining of coal mine.In order to master the law of overburden caving and fracture development in the mining process of working face,taking No.1309 working face of No.3 coal seam of a coal mine in Northern Shaanxi as the research object,the physical simulation and engineering analogy methods were used for experimental determination.The results show that the height of water flowing fracture zone after full mining is 101.7 m,and the ratio of fracture zone height to mining height is 33.9;the second key layer in overburden can effectively inhibit the development of vertical fractures,which plays a major role in controlling the development of water flowing fracture zone in the working face.The research results can provide certain guidance and reference for the prevention and control of roof water disaster in the mining process of the coal mine.